Purpose
The ATAN function returns the inverse tangent of a number. The inverse tangent of a number is the angle whose tangent is the number. The returned angle is in radians and ranges from -π/2 to π/2.
Syntax
ATAN(number)
Parameters
number is a numeric data type or a value that can be implicitly converted to a numeric data type.
Return type
The function returns a value of the NUMBER data type.
Examples
Return the inverse tangent of 0.5.
obclient> SELECT ATAN(0.5) FROM DUAL;
+-------------------------------------------+
| ATAN(0.5) |
+-------------------------------------------+
| .4636476090008061162142562314612144020285 |
+-------------------------------------------+
1 row in set